#pragma once

#include <iostream>
#include <memory>
#include <iostream>
#include <string>
#include <jsoncpp/json/json.h>

static const std::string sep = "\r\n";

// 设计一下协议的报头和报文的完整格式
// "len"\r\n"{json}"\r\n --- 完整的报文， len 有效载荷的长度！
// \r\n: 区分len 和 json 串
// \r\n: 暂是没有其他用，打印方便，debug
// 添加报头
std::string Encode(const std::string &jsonstr)
{
    int len = jsonstr.size();
    std::string lenstr = std::to_string(len);
    return lenstr + sep + jsonstr + sep;
}
// 不能带const
// "le
// "len"
// "len"\r\n
// "len"\r\n"{json}"\r\n (]
// "len"\r\n"{j
// "len"\r\n"{json}"\r\n"len"\r\n"{
// "len"\r\n"{json}"\r\n
// "len"\r\n"{json}"\r\n"len"\r\n"{json}"\r\n"len"\r\n"{json}"\r\n"len"\r\n"{json}"\r
std::string Decode(std::string &packagestream)
{
    // 分析
    auto pos = packagestream.find(sep);
    if (pos == std::string::npos)
        return std::string();
    std::string lenstr = packagestream.substr(0, pos);
    int len = std::stoi(lenstr);
    // 计算一个完整的报文应该是多长？？
    int total = lenstr.size() + len + 2 * sep.size();
    if (packagestream.size() < total)
        return std::string();

    // 提取
    std::string jsonstr = packagestream.substr(pos + sep.size(), len);
    packagestream.erase(0, total);
    return jsonstr;
}

class Request
{
public:
    Request()
    {
    }
    Request(int x, int y, char oper) : _x(x), _y(y), _oper(oper)
    {
    }

    bool Serialize(std::string *out)
    {
        // 1. 使用现成的库, xml, json(jsoncpp), protobuf
        Json::Value root;
        root["x"] = _x;
        root["y"] = _y;
        root["oper"] = _oper;
        Json::FastWriter writer;
        // Json::StyledWriter writer;
        std::string s = writer.write(root);
        *out = s;
        return true;
    }
    bool Deserialize(const std::string &in)
    {
        Json::Value root;
        Json::Reader reader;
        bool res = reader.parse(in, root);

        _x = root["x"].asInt();
        _y = root["y"].asInt();
        _oper = root["oper"].asInt();

        return true;
    }
    void Print()
    {
        std::cout << _x << std::endl;
        std::cout << _y << std::endl;
        std::cout << _oper << std::endl;
    }
    ~Request()
    {
    }
    int X()
    {
        return _x;
    }
    int Y()
    {
        return _y;
    }
    char Oper()
    {
        return _oper;
    }
    void SetValue(int x, int y, char oper)
    {
        _x = x;
        _y = y;
        _oper = oper;
    }

private:
    int _x;
    int _y;
    char _oper; // + - * / % // x oper y
};

// struct request resp={30, 0};
class Response
{
public:
    Response() : _result(0), _code(0), _desc("success")
    {
    }
    bool Serialize(std::string *out)
    {
        // 1. 使用现成的库, xml, json(jsoncpp), protobuf
        Json::Value root;
        root["result"] = _result;
        root["code"] = _code;
        root["desc"] = _desc;
        Json::FastWriter writer;
        // Json::StyledWriter writer;
        std::string s = writer.write(root);
        *out = s;
        return true;
    }
    bool Deserialize(const std::string &in)
    {
        Json::Value root;
        Json::Reader reader;
        bool res = reader.parse(in, root);
        if (!res)
            return false;
        _result = root["result"].asInt();
        _code = root["code"].asInt();
        _desc = root["desc"].asString();

        return true;
    }
    void PrintResult()
    {
        std::cout << "result: " << _result << ", code: " << _code << ", desc: " << _desc << std::endl; 
    }
    ~Response()
    {
    }

public:
    int _result;
    int _code; // 0: success, 1: div zero 2. 非法操作
    std::string _desc;
};

class Factory
{
public:
    static std::shared_ptr<Request> BuildRequestDefault()
    {
        return std::make_shared<Request>();
    }
    static std::shared_ptr<Response> BuildResponseDefault()
    {
        return std::make_shared<Response>();
    }
};